Walker



FIG. 1 is a perspective view of the walker in full lines.

FIG. 2 is a top plan view of the walker.

FIG. 3 is a bottom plan view thereof.

FIG. 4 is a front elevational view thereof.

FIG. 5 is a rear elevational view thereof.

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a right side elevational view thereof. 

CLAIM The ornamental design for a walker, as shown and described. 